An expansion tank or expansion vessel is a small tank used to protect closed (not open to atmospheric pressure) water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer and absorbs excess water pressure caused by thermal expansion.
This part is present 9 different boilers in the Baxi range including the Baxi Duotec 33 He, Duotec 40 He, Duo-Tec Combi 33 HE A, Platinum 33 HE Combi.
At the bottom of the page is an appliance table with the links to all boilers that contain this part. Please use this if you would like to view all other spares that fit that model by clicking on your appliance model and download the user manual for that appliance. If none of these models match the appliance you have, please contact us before ordering so we can confirm this part is compatible.
We recommend that all parts are fitted by a fully qualified Gas Safe Registered Engineer. If you require any help locating a part, please feel free to contact us.
|Manufacturer||Appliance Model||GC Number|
|Baxi||Duotec 33 He||47-075-24|
|Baxi||Duotec 40 He||47-075-26|
|Baxi||Duo-Tec Combi 33 HE A||47-075-37|
|Baxi||Platinum 33 HE Combi||47-077-29|
|Baxi||Platinum 40 HE Combi||47-077-30|
|Main||Main Combi 30 Eco||47-467-03|
|Potterton||Promax Combi 24HE Plus||47-393-17|
|Potterton||Promax Combi 33HE Plus||47-590-04|
Baxi / Main / Potterton 5114692 Vessel - Expansion 10L Cimm
|Part Type||Expansion Vessels|